Seleção de genótipos de porta-enxertos para limeira ácida ‘Tahiti’ tolerantes à salinidade da água de irrigação

Abstract

The production of 'Tahiti' acid lime has great expression for the Brazilian citrus industry, due to its socioeconomic importance, however, in the Northeast region, this production is limited by the water deficit, requiring the use of irrigation, which, on the other hand, is limited by the quality of the water from wells in the region, which contain high concentrations of salts, which makes the selection of tolerant rootstocks necessary. In this context, the objective was to select citrus rootstocks for the acid lime tree 'Tahiti' more tolerant to salinity using the mixed model methodology (REML/BLUP). The experiment was developed using a randomized block experimental design, with four replications and treatments arranged in a split plot, where the plot was the thirteen rootstocks grafted on acid lime tree 'Tahiti' and the subplot was the three types of water from irrigation, which had electrical conductivity (ECa) of 0.14 dS m-1, 2.4 dS m-1 and 4.8 dS m-1. Growth, physiological and production variables were evaluated during two seasons. To analyze the data, the SELEGEN software was used. The genotypes that have the best performance in salinities with CEa of 0.14 dS m-1, 2.4 dS m-1 and 4.8 dS m-1 are TSKC X CTARG - 019, TSKFL X CTTR - 013 and citrandarin 'Indio', respectively, and the most heritable variables in the first two years of production were rootstock stem diameter at salinity 1 (0.14 dSm-1) and 2 (2.4 dSm-1) and crown stem diameter at salinity 3 (4.8 dSm-1). The thirteen rootstock genotypes studied have genetic variability and indicate potential for selection.